pika: What you have to do is hook up a 16MHz crystal (Xtal, 2 pins) with capacitors (2x, 10-20picofarad) to the XTAL pins (doesn't actually matter which, but see the schematic in post #20) and then set the rest of the AVR to run off the transceiver crystal. Set the CLKSEL fuses to Transceiver Oscillator, longest possible startup time.

Try that. If it doesn't work, get back to us, and we'll blizzard you once more with irrelevant trivia.

S.

PS - The original 8pF caps you had are probably too small. S.

PPS - No, you can't do RF with the AVRs internal RC. - Edit: Ref. post above, as I did without proper credit.S.

I seslcted the option : Transceiver Oscillator;Start-up time : 16K CK +65ms. The program is flashed without any errors (using Start without degugging option). Then I tried the Start debugging option,but that leads to an error like the picture below. When I tried the internal RC it works fine. What does this mean ?